The content is deployed immediately through the Firebase CLI. Once it's uploaded, the content is served immediately. If you have made a mistake, you don't need to re-upload a new version, through the Admin dashboard you can easily rollback to a previous version.

Google acquired Firebase in Oct. 2014. This gives Firebase a degree of trustworthiness in their service and future support since they are backed by such a large company.

The documentation and quick start guides are informative and easy to learn.